New methods to calculate the life cycle analysis are available with Open LCA methods, We plan to use design models and economic models in order to select the composition of new mortars we want to develop.
Acknowledgements
We thank the programs “Make Our Planet Great Again” and “Initiative d’excellence Paris Seine” for 64providing economic support for the development of this research; and the companies Socly, Rocamat, Briqueterie d’Allone and Fédération du Verre for providing the materials for this work.
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COMPARISON OF PHYSICO-CHEMICAL PROPERTIES BETWEEN ANCIENT AND RESTORATION RENDERS IN THE VEXIN FRANÇAIS AREA (NW OF PARIS)
Claire Noël, Beatriz Menéndez
IN: SIEGESMUND, S. & MIDDENDORF, B. (EDS.): MONUMENT FUTURE: DECAY AND CONSERVATION OF STONE.
– PROCEEDINGS OF THE 14TH INTERNATIONAL CONGRESS ON THE DETERIORATION AND CONSERVATION OF STONE –
VOLUME I AND VOLUME II. MITTELDEUTSCHER VERLAG 2020.
Laboratoire Géosciences et Environnement Cergy, Université de Cergy Pontoise, 95000 Neuville-sur-Oise, France
Abstract
In the Paris area there are important gypsum resources which results in an extended use of gypsum in traditional architecture as façade renders. Traditional renders are still visible today in urban areas and in the surrounding countryside. This study concerns renders of the vernacular architecture of the Vexin Français, few tens of kilometres North-West of Paris and is based on the work carried out by Tiffanie Le Dantec in her PhD thesis. We focus our research on the analysis of ancient and new renders in order to propose suitable conservation or restoration solutions. This preliminary study compares several physical, chemical and mineralogical properties of ancient render samples and modern renders formulations used for façade restoration, in order to find possible relationships between the characteristics of studied formulations and their physical properties. The final goal is to estimate physical properties of ancient renders from their mineralogical composition.
Keywords: Traditional gypsum renders, renders conservation, renders restoration, mechanical properties, chemical analysis, hydric properties
Introduction
In the Vexin Français area, 40 to 70 km NW from Paris, two principal construction techniques are found: important buildings (churches, chateaux or big houses) are built in ashlar masonry, whereas smaller ones (farms, houses and other vernacular buildings) are made on random rubble masonry covered by renders. Nowadays many new owners of traditional buildings want to remove renders in order to show the stone masonry. This new tendency has two major disadvantages: it alters region landscape and it exposes masonry to weathering and decay induced by environmental conditions.
The long-term goal of the study is to provide proofs that traditional renders are much more adequate and durable when repairing stone façades than new cement base renders. Most of the façades in the Vexin area are made of rubble stones with a lime mortar and covered by a plaster of Paris, lime or plaster of Paris-lime render. The use of this kind of render has aesthetic purposes, helps to evacuate the humidity and has a protection role.
Our study focused on comparisons between ancient renders sampled in façades
